If you are talking about gradation limit for plaster sand then, as per IS 1542 grading of sand for internal, external and ceiling plaster is given as below
Sieve Size - Percentage passing
4.75 mm - 95 to 100%
2.36 mm - 95 to 100%
1.18 mm - 90 to 100%
600 micron - 80 to 100%
300 micron - 20 to 65%
150 micron - 0 to 15%
It also state that, for crush stone and gravel sand limits on 150 micron sieve passing is increased to 20%
This is what given in IS Code.
Are you looking for anything more? kindly do state it by replying.